import React, {Component} from 'react'

// 引入action
import {
  createIncrementAction,
  createDecrementAction,
  createIncrementAsyncAction
} from '../../redux/count_action';
// 引入connect用于连接UI组件与redux
import {connect} from 'react-redux'

class Count extends Component {

  // 加法
  increment = () => {
    const {value} = this.selectNumber
    this.props.jia(value * 1)
  }
  // 减法
  decrement = () => {
    const {value} = this.selectNumber
    this.props.jian(value * 1)
  }
  // 奇数再加
  incrementIfOdd = () => {
    const {value} = this.selectNumber
    if (this.props.count % 2 !== 0) {
      this.props.jia(value * 1)
    }
  }
  // 异步加
  incrementAsync = () => {
    const {value} = this.selectNumber
    this.props.jiaAsync(value * 1, 500)
  }

  render() {
    // console.log('UI组件接收到的props是', this.props)
    return (
      <div>
        <h1>当前求和为：{this.props.count}</h1>
        <select ref={c => this.selectNumber = c}>
          <option value="1">1</option>
          <option value="2">2</option>
          <option value="3">3</option>
        </select>&nbsp;
        <button onClick={this.increment}>+</button>&nbsp;
        <button onClick={this.decrement}>-</button>&nbsp;
        <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
        <button onClick={this.incrementAsync}>异步加</button>
      </div>
    );
  }
}

// 使用connect()()创建并暴露一个Count的容器组件
export default connect(
  state => ({count: state}),
  // mapDispatchToProps的一般写法
  // dispatch => ({
  //   jia: number => dispatch(createIncrementAction(number)),
  //   jian: number => dispatch(createDecrementAction(number)),
  //   jiaAsync: (number, time) => dispatch(createIncrementAsyncAction(number, time))
  // })
  // mapDispatchToProps的简写
  {
    jia: createIncrementAction,
    jian: createDecrementAction,
    jiaAsync: createIncrementAsyncAction
  }
)(Count)